It is a very old bug. It doesn't matter which Mac OS or Illustrator version you have installed. After working a few doing charts, Illustrator stops accepting pasted data. Adobe doesn't care about as they doesn't care about copy/paste in place on artboards (another annoying bug).

Same here it is very annoying, I even chat with tech support and the only reset prefs, but then the issue came back!

Same here. Very annoying as it disrupts with my workflow. Had to open-close the project I'm doing multiple time every 2 minutes is crazy, as I mainly deal with text and typography in my work.

The copy paste function works as usual in other apps.

I have this problem too, it's really messing with my workflow. I tried different troubleshooting but all is good. I can copy-paste and cut-paste on other software without a problem, so I believe it's a problem with Illustrator.

I have the same problem. Please do something Adobe. ITS ANNOYING AND I COMPROMISE MY WORKFLOW.

This often happen with text box (I have to outline everything and then the program allows me to copy and paste).

I have already tried several times with erase the clipboard and also with restore the preferences (Edition --> General). Those two methods sometimes work, but lately this bug got RANDOM and right now is happening again and nothing is working, I DONT WANT TO RESTART THE PROGRAM.

Again, ANNOYING AND IM PAYING FOR THIS!

This has been an issue for years, judging by the unresolved Reddit / Adobe forum posts. It's infuriating, such a basic and needed feature doesn't work! I find it super annoying, 4 out of 5 times it doesn't paste.

Also, when I just quit Illustrator this message appeared in After Effects:

After Effects (Beta) error: could not parse mask shape on clipboard.

Win 10, v27.2, NVIDIA 497.29

Hi, I can sometimes copy / cut and paste in Illustrator, sometimes not. This has only been noticed in the last day or so. Could be tied to certain documents, unclear as of yet. I have tried copying (when it works) a document's contents into a new do, and the problem persists, which may indicate that there is a problem with some of the artwork?

When it doesn't want to copy it doesn't matter if I'm using keyboard shortcuts or the menu option, the copy operation does not work and the paste menu items remain greyed out. Very similar to the symptoms reported here: https://community.adobe.com/t5/illustrator-discussions/copy-paste-command-not-working/td-p/13368238

I'd class this as a critical bug, as it's affecting basic system functions. Copy and paste are working fine in all other apps tested.

Any help or guidance much appreciated, as this is seriously affecting my ability to deliver for clients.